1 /*
2 * Copyright (c) 1998, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #pragma warning(disable: 4035) // Disable warning 4035: no return value
26
27 // Efficient swapping of data bytes from Java byte
28 // ordering to native byte ordering and vice versa.
29 inline u2 Bytes::swap_u2(u2 x) {
30 #ifdef AMD64
31 address p = (address) &x;
32 return ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
33 #else
34 __asm {
35 mov ax, x
36 xchg al, ah
37 }
38 // no return statement needed, result is already in ax
39 // compiler warning C4035 disabled via warning pragma
40 #endif // AMD64
41 }
42
43 inline u4 Bytes::swap_u4(u4 x) {
44 #ifdef AMD64
63
64 #else
65 // Helper function for swap_u8
66 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
67 __asm {
68 mov eax, y
69 mov edx, x
70 bswap eax
71 bswap edx
72 }
73 // no return statement needed, result is already in edx:eax
74 // compiler warning C4035 disabled via warning pragma
75 }
76
77 inline u8 Bytes::swap_u8(u8 x) {
78 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
79 }
80 #endif // AMD64
81
82 #pragma warning(default: 4035) // Enable warning 4035: no return value
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1 /*
2 * Copyright (c) 1998, 2010, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
26 #define OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
27
28 #pragma warning(disable: 4035) // Disable warning 4035: no return value
29
30 // Efficient swapping of data bytes from Java byte
31 // ordering to native byte ordering and vice versa.
32 inline u2 Bytes::swap_u2(u2 x) {
33 #ifdef AMD64
34 address p = (address) &x;
35 return ( (u2(p[0]) << 8 ) | ( u2(p[1])) );
36 #else
37 __asm {
38 mov ax, x
39 xchg al, ah
40 }
41 // no return statement needed, result is already in ax
42 // compiler warning C4035 disabled via warning pragma
43 #endif // AMD64
44 }
45
46 inline u4 Bytes::swap_u4(u4 x) {
47 #ifdef AMD64
66
67 #else
68 // Helper function for swap_u8
69 inline u8 Bytes::swap_u8_base(u4 x, u4 y) {
70 __asm {
71 mov eax, y
72 mov edx, x
73 bswap eax
74 bswap edx
75 }
76 // no return statement needed, result is already in edx:eax
77 // compiler warning C4035 disabled via warning pragma
78 }
79
80 inline u8 Bytes::swap_u8(u8 x) {
81 return swap_u8_base(*(u4*)&x, *(((u4*)&x)+1));
82 }
83 #endif // AMD64
84
85 #pragma warning(default: 4035) // Enable warning 4035: no return value
86
87 #endif // OS_CPU_WINDOWS_X86_VM_BYTES_WINDOWS_X86_INLINE_HPP
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